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Accounts and notes receivable, net
 12 Months Ended
Dec. 31, 2021
Receivables [Abstract]  
Accounts receivable, net
3
Accounts and notes receivable, net
 
     As of December 31,  
     2020      2021  
     RMB      RMB      US$  
Accounts and notes receivable
      88,706        81,550        12,797  
Less: allowance for doubtful accounts
      (43,820 )       (37,690 )       (5,914 ) 
    
 
 
     
 
 
     
 
 
  
Total accounts and notes receivable, net
      44,886        43,860        6,883  
    
 
 
     
 
 
     
 
 
  
The following table presents the movement in the allowance for doubtful accounts:
 
     As of December 31,  
     2020      2021  
     RMB      RMB      US$  
Balance at beginning of year
      28,516        43,820        6,876  
Provisions
      18,732        (246 )       (39 ) 
Write-offs
      (3,428 )       (5,884 )       (923 ) 
    
 
 
     
 
 
     
 
 
  
Balance at end of year
      43,820        37,690        5,914